A potential plant to consider for shade is Melanthium latifolium, the Slender Bunchflower, found growing in "dry, rocky, wooded slopes" in a limited north to south distribution in Eastern USA. It is pictured and discussed in more detail on NARGS Forum: https://nargs.org/forum/melanthium-bunchflower/ Mark McDonough USDA Zone 5 Massachusetts, near the New Hampshire border, USA